﻿/*
	© 2014-2016, 2019 FrankHB.

	This file is part of the YSLib project, and may only be used,
	modified, and distributed under the terms of the YSLib project
	license, LICENSE.TXT.  By continuing to use, modify, or distribute
	this file you indicate that you have read the license and
	understand and accept it fully.
*/

/*!	\file cmath.h
\ingroup LibDefect
\brief 标准库实现 \c \<cmath> 修正。
\version r614
\author FrankHB <frankhb1989@gmail.com>
\since build 308
\par 创建时间:
	2014-11-24 06:53:27 +0800
\par 修改时间:
	2019-11-03 16:03 +0800
\par 文本编码:
	UTF-8
\par 模块名称:
	LibDefect::CMath
*/


#ifndef YB_INC_libdefect_cmath_h_
#define YB_INC_libdefect_cmath_h_ 1

#include <cmath>

#if defined(__GLIBCXX__) \
	&& (defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L) \
	&& !(defined(_GLIBCXX_USE_C99_MATH_TR1))

extern "C++"
{

namespace std _GLIBCXX_VISIBILITY(default)
{

#ifdef _GLIBCXX_BEGIN_NAMESPACE_VERSION
_GLIBCXX_BEGIN_NAMESPACE_VERSION
#endif

#undef acosh
#undef acoshf
#undef acoshl
#undef asinh
#undef asinhf
#undef asinhl
#undef atanh
#undef atanhf
#undef atanhl
#undef cbrt
#undef cbrtf
#undef cbrtl
#undef copysign
#undef copysignf
#undef copysignl
#undef erf
#undef erff
#undef erfl
#undef erfc
#undef erfcf
#undef erfcl
#undef exp2
#undef exp2f
#undef exp2l
#undef expm1
#undef expm1f
#undef expm1l
#undef fdim
#undef fdimf
#undef fdiml
#undef fma
#undef fmaf
#undef fmal
#undef fmax
#undef fmaxf
#undef fmaxl
#undef fmin
#undef fminf
#undef fminl
#undef hypot
#undef hypotf
#undef hypotl
#undef ilogb
#undef ilogbf
#undef ilogbl
#undef lgamma
#undef lgammaf
#undef lgammal
#undef llrint
#undef llrintf
#undef llrintl
#undef llround
#undef llroundf
#undef llroundl
#undef log1p
#undef log1pf
#undef log1pl
#undef log2
#undef log2f
#undef log2l
#undef logb
#undef logbf
#undef logbl
#undef lrint
#undef lrintf
#undef lrintl
#undef lround
#undef lroundf
#undef lroundl
#undef nan
#undef nanf
#undef nanl
#undef nearbyint
#undef nearbyintf
#undef nearbyintl
#undef nextafter
#undef nextafterf
#undef nextafterl
#undef nexttoward
#undef nexttowardf
#undef nexttowardl
#undef remainder
#undef remainderf
#undef remainderl
#undef remquo
#undef remquof
#undef remquol
#undef rint
#undef rintf
#undef rintl
#undef round
#undef roundf
#undef roundl
#undef scalbln
#undef scalblnf
#undef scalblnl
#undef scalbn
#undef scalbnf
#undef scalbnl
#undef tgamma
#undef tgammaf
#undef tgammal
#undef trunc
#undef truncf
#undef truncl


#ifdef __BIONIC__
// XXX: Old versions of Bionic do not define %::float_t and %::double_t. These
//	declarations should be compatible with new versions.
using float_t = float;
using double_t = double;
#else
using ::double_t;
using ::float_t;
#endif

// XXX: Detection of availability of 'long double' is not necessarily reliable.
//	Be conservative.
#	define YB_LibDefect_CMath_using_f(_fn) \
	using ::_fn; \
	using ::_fn##f;
#	define YB_LibDefect_CMath_using_fl(_fn) \
	YB_LibDefect_CMath_using_f(_fn) \
	using ::_fn##l;

// NOTE: In Bionic some functions supporting 'long double' are introduced
//	since API level 21. They are not respected here because most of them are
//	renamed symbols (by assembly) which do not provide significant better
//	choices in C++, and there may have architectural issues among different
//	versions. Since %__BIONIC__ does not expose a reliable way to detect the
//	version of libc, no further work is done here. Further, libstdc++ is already
//	not supported for new versions of NDK, this header should normally not used
//	for new NDK versions (e.g. by tested configurations of YSLib, since NDK
//	r9c).
#ifndef __BIONIC__
#	define YB_LibDefect_CMath_using(_fn) \
	YB_LibDefect_CMath_using_fl(_fn)
#else
#	define YB_LibDefect_CMath_using(_fn) \
	YB_LibDefect_CMath_using_f(_fn)
#endif

YB_LibDefect_CMath_using(acos)
YB_LibDefect_CMath_using(asin)
YB_LibDefect_CMath_using(atan)
YB_LibDefect_CMath_using(cbrt)
YB_LibDefect_CMath_using(copysign)
YB_LibDefect_CMath_using(erf)
YB_LibDefect_CMath_using(erfc)
YB_LibDefect_CMath_using(exp2)
YB_LibDefect_CMath_using(expm1)
YB_LibDefect_CMath_using(fdim)
YB_LibDefect_CMath_using(fma)
YB_LibDefect_CMath_using(fmax)
YB_LibDefect_CMath_using(fmin)
YB_LibDefect_CMath_using(hypot)
YB_LibDefect_CMath_using(ilogb)
YB_LibDefect_CMath_using(lgamma)
YB_LibDefect_CMath_using(llrint)
YB_LibDefect_CMath_using(llround)
YB_LibDefect_CMath_using(log1p)
#ifndef __BIONIC__
#	ifndef _NEWLIB_VERSION
YB_LibDefect_CMath_using(log2)
#	else
YB_LibDefect_CMath_using_f(log2)
#	endif
#endif
#ifndef _NEWLIB_VERSION
YB_LibDefect_CMath_using_f(logb)
#else
YB_LibDefect_CMath_using(lrint)
#endif
YB_LibDefect_CMath_using(lround)
#ifndef __BIONIC__
YB_LibDefect_CMath_using(nan)
#endif
YB_LibDefect_CMath_using(nearbyint)
YB_LibDefect_CMath_using(nextafter)
#ifndef _NEWLIB_VERSION
YB_LibDefect_CMath_using(nexttoward)
#endif
YB_LibDefect_CMath_using(remainder)
YB_LibDefect_CMath_using(remquo)
YB_LibDefect_CMath_using(rint)
YB_LibDefect_CMath_using(round)
YB_LibDefect_CMath_using(scalbln)
YB_LibDefect_CMath_using(scalbn)
#ifndef __BIONIC__
YB_LibDefect_CMath_using(tgamma)
#else
using ::tgamma;
#endif
YB_LibDefect_CMath_using(trunc)

#undef YB_LibDefect_CMath_using
#undef YB_LibDefect_CMath_using_fl
#undef YB_LibDefect_CMath_using_f

#if __clang__
// NOTE: See also https://llvm.org/bugs/show_bug.cgi?id=18327.
#	define YB_LibDefect_CMath_constfn inline
#else
#	define YB_LibDefect_CMath_constfn constexpr
#endif

#define YB_LibDefect_CMath_builtin(_n, ...) \
	{ \
		return __builtin_##_n(__VA_ARGS__); \
	}
#define YB_LibDefect_CMath_fn(_t, _fn, _n) \
	YB_LibDefect_CMath_constfn _t \
	_fn(_t __x) \
	YB_LibDefect_CMath_builtin(_n, __x)
#define YB_LibDefect_CMath_fn2(_t, _fn, _n) \
	YB_LibDefect_CMath_constfn _t \
	_fn(_t __x, _t __y) \
	YB_LibDefect_CMath_builtin(_n, __x, __y)
#define YB_LibDefect_CMath_fns(_fn) \
	YB_LibDefect_CMath_fn(float, _fn, _fn##f) \
	YB_LibDefect_CMath_fn(long double, _fn, _fn##l) \
	template<typename _Tp> \
	YB_LibDefect_CMath_constfn typename \
		__gnu_cxx::__enable_if<__is_integer<_Tp>::__value, double>::__type \
	_fn(_Tp __x) \
	YB_LibDefect_CMath_builtin(_fn, __x)
#define YB_LibDefect_CMath_fns2(_fn) \
	YB_LibDefect_CMath_fn2(float, _fn, _fn##f) \
	YB_LibDefect_CMath_fn2(long double, _fn, _fn##l) \
	template<typename _Tp, typename _Up> \
	YB_LibDefect_CMath_constfn \
		typename __gnu_cxx::__promote_2<_Tp, _Up>::__type \
	_fn(_Tp __x, _Up __y) \
	{ \
		using __type = typename __gnu_cxx::__promote_2<_Tp, _Up>::__type; \
		\
		return _fn(__type(__x), __type(__y)); \
	}

#define YB_LibDefect_CMath_trigo(_n) \
	YB_LibDefect_CMath_fns(a##_n##h)

YB_LibDefect_CMath_trigo(cos)

YB_LibDefect_CMath_trigo(sin)

YB_LibDefect_CMath_trigo(tan)

#undef YB_LibDefect_CMath_trigo

YB_LibDefect_CMath_fns(cbrt)

YB_LibDefect_CMath_fns2(copysign)

YB_LibDefect_CMath_fns(erf)

YB_LibDefect_CMath_fns(erfc)

YB_LibDefect_CMath_fns(exp2)

YB_LibDefect_CMath_fns(expm1)

YB_LibDefect_CMath_fns2(fdim)

YB_LibDefect_CMath_constfn float
fma(float __x, float __y, float __z)
YB_LibDefect_CMath_builtin(fmaf, __x, __y, __z)
YB_LibDefect_CMath_constfn long double
fma(long double __x, long double __y, long double __z)
YB_LibDefect_CMath_builtin(fmal, __x, __y, __z)
template<typename _Tp, typename _Up, typename _Vp>
YB_LibDefect_CMath_constfn \
	typename __gnu_cxx::__promote_3<_Tp, _Up, _Vp>::__type
fma(_Tp __x, _Up __y, _Vp __z)
{
	using __type = typename __gnu_cxx::__promote_3<_Tp, _Up, _Vp>::__type;

	return fma(__type(__x), __type(__y), __type(__z));
}

YB_LibDefect_CMath_fns2(fmax)

YB_LibDefect_CMath_fns2(fmin)

YB_LibDefect_CMath_fns2(hypot)

YB_LibDefect_CMath_fns(ilogb)

YB_LibDefect_CMath_fns(lgamma)

YB_LibDefect_CMath_fns(llrint)

YB_LibDefect_CMath_fns(llround)

YB_LibDefect_CMath_fns(log1p)

// DR 568.
YB_LibDefect_CMath_fns(log2)

YB_LibDefect_CMath_fns(logb)

YB_LibDefect_CMath_fns(lrint)

YB_LibDefect_CMath_fns(lround)

YB_LibDefect_CMath_fns(nearbyint)

YB_LibDefect_CMath_fns2(nextafter)

YB_LibDefect_CMath_constfn float
nexttoward(float __x, long double __y)
YB_LibDefect_CMath_builtin(nexttowardf, __x, __y)
YB_LibDefect_CMath_constfn long double
nexttoward(long double __x, long double __y)
YB_LibDefect_CMath_builtin(nexttowardl, __x, __y)
template<typename _Tp>
YB_LibDefect_CMath_constfn
	typename __gnu_cxx::__enable_if<__is_integer<_Tp>::__value, double>::__type
nexttoward(_Tp __x, long double __y)
YB_LibDefect_CMath_builtin(nexttoward, __x, __y)

YB_LibDefect_CMath_fns2(remainder)

inline float
remquo(float __x, float __y, int* __pquo)
YB_LibDefect_CMath_builtin(remquof, __x, __y, __pquo)
inline long double
remquo(long double __x, long double __y, int* __pquo)
YB_LibDefect_CMath_builtin(remquol, __x, __y, __pquo)
template<typename _Tp, typename _Up>
inline typename __gnu_cxx::__promote_2<_Tp, _Up>::__type
remquo(_Tp __x, _Up __y, int* __pquo)
{
	using __type = typename __gnu_cxx::__promote_2<_Tp, _Up>::__type;

	return remquo(__type(__x), __type(__y), __pquo);
}

YB_LibDefect_CMath_fns(rint)

YB_LibDefect_CMath_fns(round)

YB_LibDefect_CMath_constfn float
scalbln(float __x, long __ex)
YB_LibDefect_CMath_builtin(scalblnf, __x, __ex)
YB_LibDefect_CMath_constfn long double
scalbln(long double __x, long __ex)
YB_LibDefect_CMath_builtin(scalblnl, __x, __ex)
template<typename _Tp>
YB_LibDefect_CMath_constfn
	typename __gnu_cxx::__enable_if<__is_integer<_Tp>::__value, double>::__type
scalbln(_Tp __x, long __ex)
YB_LibDefect_CMath_builtin(scalbln, __x, __ex)

YB_LibDefect_CMath_constfn float
scalbn(float __x, int __ex)
YB_LibDefect_CMath_builtin(scalbnf, __x, __ex)
YB_LibDefect_CMath_constfn long double
scalbn(long double __x, int __ex)
YB_LibDefect_CMath_builtin(scalbnl, __x, __ex)
template<typename _Tp>
YB_LibDefect_CMath_constfn
	typename __gnu_cxx::__enable_if<__is_integer<_Tp>::__value, double>::__type
scalbn(_Tp __x, int __ex)
YB_LibDefect_CMath_builtin(scalbn, __x, __ex)

YB_LibDefect_CMath_fns(tgamma)

YB_LibDefect_CMath_fns(trunc)

#undef YB_LibDefect_CMath_fns
#undef YB_LibDefect_CMath_fn2
#undef YB_LibDefect_CMath_fn
#undef YB_LibDefect_CMath_builtin
#undef YB_LibDefect_CMath_constfn

#ifdef _GLIBCXX_END_NAMESPACE_VERSION
_GLIBCXX_END_NAMESPACE_VERSION
#endif

} // namespace std;

} // extern "C++";

#endif

#endif

